Physics

Problem

Four point charges are fixed at the corners of a square of side length

a

. Charges of magnitude

+q

occupy opposite corners, while charges of magnitude

-q

occupy the remaining two corners. What is the total electric potential energy of the configuration? a)

(4+\sqrt2)\,\dfrac{kq^{2}}{a}

-4\,\dfrac{kq^{2}}{a}

(\sqrt{2}-4)\,\dfrac{kq^{2}}{a}

(2\sqrt{2}-8)\,\dfrac{kq^{2}}{a}